When inside if you possess the Delkfutt Key, head to (E-8) and continue down the stairs to enter the basement. Otherwise start the climb process detailed below.

Obtaining Delkfutt Key Short Way

This is the shortest route. You may be Tractored through the door to the basement at E-8 without the key if a party member already has it. Next you can open the door at J-8. Click it to travel too Upper Delkfutt's Tower. Walk forward then click the ??? at the bottom of the stairs to be teleported directly to Porphyrion, kill this NM then trade the key it drops to the Elevator directly beside it, press onward and you will receive the key item needed too receive the cutscene at your nations door, and to open the door you were Tractored through.

You may now discard the key.

There may be people farming this NM to desynth the keys into Spheers so you may want to ask them to team up.

Head to the bottom of the stairs then East and pass through the door to reach the basement.

Finishing the Mission

Once you reach the basement head east into a large room and click on the door at (M-7) for a cutscene. If you do not get the cutscene you are probably at the wrong door.

After the cutscene warp out or head South West and down a long hallway, this will take you back to the first floor of the tower. Follow the right wall until you zone back into Qufim Island.

Return to the embassy in Ru'Lude Gardens and examine the "Door: Windurstian Emb." to complete the mission.

You must pass through 2 other doors then click the 3rd one.

Obtaining Delkfutt Key Long Way

This process involves a VERY long climb with lots of dangerous monsters. If you are below level 50, bring someone high level with you or a party of at least 6. Sneak/Invisible (Status) or Prism Powder/Silent Oil are also recommended. Some form of Reraise and Warp is also helpful.

When you zone in head through the door to the southeast and down a hallway. You will find a door on your right at H-7. This door is guarded by Mimas a Gigas NM that uses Hundred Fists. After killing Mimas and clearing the hallway enter the door at H-7 into a large room. This room will be filled with Gigas and a NM named Porphyrion.

Try to pull Porphyrion out into the hallway without linking any of the other Gigas. Summoner or a high level helper is useful for this.

Once you have your key trade it to the elevator on the floor at H-8 inside Porphyrions room.

Walk down the LONG staircase after using the elevator to get to the basement.

If you chose this long way see above "Finishing The Mission"

Notes

You do not have to be on this mission to receive a Delkfutt Key from Porphyrion.

If you already possess a key from defeating Porphyrion before you activated the mission, from completing the mission for another nation, or from having the Key Item version Delkfutt key, you can access the basement without traversing to the top of the tower.

On the first floor, trade your Delkfutt Key to the door at (E-8) on the first floor. If you possess the Key Item variant, simply examine the door. This will give you access to the basement where the ambassador is being held.